The Deep Sea

(Based on Cosmic Horror & Alien Realities, Story)

The submarine Nautilus II was built to withstand pressures that would instantly turn a human being into a red paste. Inside the cramped, titanium-reinforced sphere, Dr. Elena Vance and her pilot, Marcus, watched the digital depth gauge tick upward.9,800 meters. 10,200 meters. 10,900 meters.They were at the absolute bottom of the Mariana Trench, a place where light had never existed since the dawn of the planet. Outside the tiny, thick quartz viewport, the ocean was a crushing, black void."Deploying the external floodlights," Marcus announced, his voice tense. He flipped a series of heavy switches.Ultra-bright LED arrays flared to life, cutting through the abyssal water. The light revealed the trench floor: a barren, eerie desert of pale silt and strange, ethereal sea cucumbers that drifted like ghosts."Wait," Elena said, leaning closer to the viewport. "Marcus, look at the topography ahead. That’s not a natural rock formation."The seafloor didn't slope upward; it flattened out into a perfectly level, smooth plane. As the Nautilus II drifted forward, the powerful lights reflected off the surface below them. It wasn't stone or mud. It was dark, flawless, polished glass."What is that? An obsidian shelf?" Marcus asked, maneuvering the thrusters to hover just three feet above the surface."No," Elena whispered, her heart hammering against her ribs. "Look at the reflections. Obsidian isn't this perfectly refractive. It's... it's a window."She cleared her throat, tapping the glass of the viewport. The exterior cameras confirmed it. The submarine was sitting on a massive, seamless pane of glass that stretched out in every direction as far as the floodlights could reach. It was an architectural barrier, separating the ocean floor from whatever lay beneath the crust of the Earth."Elena," Marcus said, his voice dropping to a terrified whisper. "The sonar. It’s not bouncing back from the seafloor anymore. It’s passing right through."Elena didn't look at the monitor. She couldn't take her eyes off the viewport.Deep beneath the glass pane, miles below the trench, a light was turning on. It wasn't the harsh, artificial light of the submarine, but a faint, bioluminescent violet glow that pulsed like a heartbeat. The light grew larger, rising up from the impossible depths toward the glass barrier.As the glow neared the surface, the structural shape of the entity became clear. It was an eye.The iris alone was larger than a football stadium, a swirling vortex of deep purple and gold. It floated up through the subterranean void until it was pressed flush against the bottom of the glass pane, staring directly up at the tiny, insignificant metal cylinder of the submarine.The Nautilus II began to vibrate, a low, sub-audible hum rattling the instrument panels."Marcus," Elena breathed, her eyes reflecting the giant, alien pupil below. "Turn off the lights.""I... I can't," Marcus stammered, his fingers frozen on the control panel as he stared out the window. "Elena, it's not looking at us. It's looking past us. It's looking up at the surface."